Lifting-jack



(No Model) W. H. COX.

LIFTING JACK.

No. 468,965. Patented Feb. 16, 1892.

INVENTOH 493 M M6 By m ATTORNEYS,

UNITE STATES ATENT OFFICE.

IVILLIAM H. COX, OF VIRDEN, ILLINOIS.

L|FT|NG-JACK.,

SPECIFICATION forming part of Letters Patent No. 468,965, dated February16, 1892. Application filed November 30, 1891. Serial No. 413.563. (Nomodel.)

To all whom it may concern:

Be it known that I, WILLIAM H. OoX,acitizen of the United States,residing at Vii-den, 1n the county of Macoupin and State of Illinois,haveinvented certain newand useful Improvements in Lifting-Jacks; and Ido declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same, referencebeing had to theaccompanying drawings, and to the figu res of reference marked thereon,which form a part of this specification. My invention relates to thoselifting-jacks in which a vertically-movable bracket slides upon anupright to allow it to be drawn up under the objeot'to be lifted,andthen raised still higher by the downward movement of the lever, whichlever is movable with the bracket.

The object of my invention is to produce a more durable andeasily-operated device.

With this end in view my invention consists of the peculiar features andcombina-' tions of parts more fully described hereinafter, and pointedout in the claims.

In the accompanying drawings, Figure 1 represents a side elevation of mydevice in which the lever is shown raised to an almost verticalposition, as in the adjusting operation Fig. 2, a similar view in whichthe lever is shown depressed, as in the lifting operation Fig. 3, a'detail View of the sliding bracket with the lever broken off; Fig. 4, adetail View of the runner in perspective. tail view showing the mannerof attaching the spring to the runner.

The reference-figure 1 represents a base, to which is pivotally secureda vertical standard 2, having a handle 3, by which the jack is movedabout. A vertically-movable bracket 4 is secured upon the standard bymeans of a movable sleeve 5, which loosely embraces the standard 2. Theupper face of the bracket 4 is concaved to receive the axle of thewagon, to be lifted. movable fulcrum 7, has its short arm 8 fulcrumed tothe bracket 4 at 9, and to its long arm is fitted a handle or lever 10.The short arm 8 of the bell-crank lever has a shoulder. or lug 11, whichengages the under side of the Fig. 5 is a de- A bell-crank lever 6,having a bracket 4 and limits the downward movement of the handle 10. Onthe under side of the bracket, between the sleeve 5 and the fulcrum 9,is a recess 12, which, when the lever 10 is raised, receives the movablefulcrum 7, it fitting snugly in the recess. The fulcrum 7 of the leverworks in the end of a downwardly extending supporting-rod-l3, forming aseat, which rod is pivoted at 14 to a runner15, the runner having anorifice 16 through which passes the standard 2. The supporting-rod ispivoted in a slot 17 in the runner to allow it lateral play as the rodis-changed from one position to another. (Seen more clearly in Figs. 1and 2.) Projecting outwardly from the rear end of the runner 15 is alug18, having a lateral slot 10 in its center, through which passes areleasing-rod 20, which has its lower end secured in adownwardly-extending portion of the lug 1S, and the upper end of the rodengages a projecting lug 21 on the top of the sleeve 5 when adjustingthe jack after having first passed through a guiding lug or projection22 on the lower end of the movable sleeve 5. Bearing against the frontface of the standard 2 is an inverted-U shaped spring 25, the lower endsof which are bent around projecting lugs 23 on each side of the runner15 and fastened to the pivot-pin 14, which also acts as a pivot for thesupporting-rod 13. The inner edges of the runner 15 are adapted to clampthe standard 2 and-hold the runner securely in that position when thepressure of the releasing-rod 20 is Withdrawn.

The object of pivoting the standard 2 to the base is to allow thestandard a limited amount of lateral play, so that the base will alwayshave a firm seat upon the ground. I I

In using my jack the operator first places it beneath the axle of thewagon to be lifted, such as 24, then draws the lever 10 up to an almostvertical position, thereby pressing on the releasing-rod 20, which inturn presses against the runner, the outer end of which presses againstthe spring 25 and allows the runner 15 to assume an almost horizontalposition, whereupon it will slide freely on the standard 2. I thendepress the lever 10, thereby pushing the fulcrum out directly beneaththe pivotal point of the short arm of the lever to produce a toggle-linkaction and which will allow the spring 25 to exert its force, andthereby moving the runner into an inclined position and which locksitself tightly on the standard 2, for the weight of the bracket 4, thesleeve 5, and the supporting-rod 13 are brought down on the front end ofthe runner. Hence it will be seen that the runner automatically locksitself to the standard when the bracket is lifted to the desired height.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In alifting-jack, the combination of a 'vertical standard, alifting-bracket arranged to slide upon the standard, and a leverfulcrumed on a movable support, arranged to antomatically lock itself tothe standard, the short arm of said lever being pivoted directly beneaththe lifting portion of the bracket,

whereby the fulcrum of the lever is brought directly beneathsaid-lifting portion, in the manner and for the purpose set forth.

2. In a lifting-jack, the combination of a bracket adapted to slide upona vertical standard, a lever having its short arm pivoted to the bracketdirectly beneath its lifting portion, and a fulcrum mounted on the endof a pivoted bar, said bar having its lower end pivotally attached to arunner arranged to automatically lock itself to the standard, as setforth.

In a lifting-jack, the combination of a vertical standard, a runnermovable on said standard, and a spring bent in the shape of a loop, theends of :which are secured to the runner and the loop partbearingagainst the standard, as set forth.

4. In a lifting-jack, the combination of a standard, a runner movable onsaid standard, and a spring made of an integral piece of wire bentin theshape of a loop, which loop bears against the front face of the standardand has its ends bent around lugs on each slde of the runner, wherebythe runner is normally locked to the standard, in the manner and 1 forthe purpose substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM H. ooX.

' Witnesses:

L. 00X, HERBERT H. (Iowan,

